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Figure 1: (a and b) Linear correlation between standard TTE and HHU for (a) LVEF and (b) WMSI, with a concordance correlation coefficient of 0.71 for LVEF and 0.76 for WMSI. (c and d) Bland–Altman correlation between standard TTE and HHU for (c) LVEF and (d) WMSI. The dark horizontal line in the middle represents the mean of the difference between TTE and HHU. The light dashed lines represent 2 SDs away from the mean difference. (c) For LVEF, Bland–Altman correlation demonstrates a larger difference between the TTE and HHE within the midrange of LVEF, whereas for WMSI, largest difference between the HHU and standard TTE occurred in the mid to upper to end of the reported range, between 1.5 and 2.5. HHU = Handheld ultrasonography, LVEF = Left ventricular ejection fraction, SD = Standard deviation, TTE = Transthoracic echocardiography, WMSI = Wall motion score index 
